People attend to a victim who was hit by a car during the Hikers Parade at the Trail Days festival in Damascus, Va., Saturday, May 18, 2013. Witnesses said the car drove into a crowd at the parade and hurt several people, but the nature of their injuries

Deward Blevins, 87, of Shady Valley, Tenn., had a medical issue that caused him to lose control of his car in the Saturday incident that injured about 50 people, Nunley said.

While the investigation is ongoing, Nunley said authorities "compared notes" and haven't found any criminal intent in what witnesses called a frantic scene at the parade.

The exact nature of the medical situation was not disclosed. Blevins remained hospitalized in stable condition on Tuesday, Nunley said.

Nunley said that Blevins was participating in the parade and that he had traversed the Appalachian Trail in the past.

Blevins' 1997 Cadillac was one of the last vehicles in the Hikers Parade at the Trail Days festival, an annual celebration of the Appalachian Trail in Damascus, near the Tennessee state line, about a half-hour drive east of Bristol. At around 2:10 p.m. Saturday, his car accelerated to about 25 mph and struck the crowd on a two-lane bridge along the town's main road. Read the original article reporting the crash here.

The injuries suffered ranged from critical to superficial. Most were treated and released Saturday. Two were kept at hospitals overnight, but their injuries were not critical as of Sunday, said Pokey Harris, Washington County's director of emergency management. Hospital officials did not immediately provide updated conditions on Tuesday.

No telephone number for Blevins was found and a telephone message for a relative was not immediate returned.